<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			* {
				margin: 0;
				padding: 0;
			}

			.box {
				height: 150px;
				text-align: center;
				padding-top: 50px;
				background-color: rgba(255, 255, 255, 0.2);
			}

			img {
				width: 150px;
			}

			body {
				background-image: url(../img/2.jpg);
			}
		</style>
	</head>
	<body>
		<div class="box">
			<img src="../img/1.jpg">
			<img src="../img/2.jpg">
			<img src="../img/3.jpg">
			<img src="../img/4.jpg">
			<img src="../img/5.jpg">
		</div>
		<script type="text/javascript">
			window.onload = function() {
				var images = document.getElementsByTagName("img");
				for (var i = 0; i < images.length; i++) {
					images[i].onclick = function() {
						// this 代表当前设置点击事件的对象images[i]
						var imageUrl = this.src;
						console.log(imageUrl);
						//document.body.style.backgroundImage = "url(../img/5.jpg)";
						document.body.style.backgroundImage = "url(" + imageUrl + ")"
					}

				}

			}
		</script>
	</body>
</html>
